911's make their own beautiful sound. I agree their stereo system is terrible. Speaker placement is challenging and they don't seem to use the best quality components. I will note that the Cayenne is a very different story. The speakers/stereo in that was just excellent, must be the center channel...

Primary: MD600, MS200 (SpeakerLink to AES), Trinnov ST-2, Ayre V6-xe, Salk SS8 3x LRC.
Secondary: MC600 (whole house).
Zone one: 568.2, G57, MS200, Spatial Hologram M2SE.
Zone 2-6 (Awaiting assignment).